The Lunchbox is a really interesting movie with clear character development, but requires patience for its slow progression and sub-titles, and you may feel it lacks a real conclusion.
As “visheshvijay” says in his review at IMDb:
There’s a simple line in this sumptuous film that captures its essence beautifully: “Sometimes even the wrong train can take you to the right destination.” It’s a line that might help interpret the film’s open ending, but one that also nicely sums up its unique premise.